Did you think I was offering a great new design? Unfortunately I am not. But I am hoping that through some brain-storming from all of you we might be able to obtain it.
Suppose you have a circuit that senses nightfall and turns on a single LED. Now suppose that you have it located within view but are not interested in using it full potential(3-4 LED's). What we need is a very frugal way to detect that someone has come close enough to the light to realize that they are now interested in more light! Thus we need a way to detect this and crank up the light until that someone has left the scene.
Since the direction of approach is unknown I was leaning towards a sound activated switch of sorts that stays on as long as the sound intensity is loud enough. Maybe an sensitive mic fed into an ultra-low power logarithmic op-amp/comparator circuit could do the trick, I don't know. Bottom line is that if the operation of this sensing circuitry drawn more power than the extra 2-3 LED's then all is mute.
Any suggestions??
Suppose you have a circuit that senses nightfall and turns on a single LED. Now suppose that you have it located within view but are not interested in using it full potential(3-4 LED's). What we need is a very frugal way to detect that someone has come close enough to the light to realize that they are now interested in more light! Thus we need a way to detect this and crank up the light until that someone has left the scene.
Since the direction of approach is unknown I was leaning towards a sound activated switch of sorts that stays on as long as the sound intensity is loud enough. Maybe an sensitive mic fed into an ultra-low power logarithmic op-amp/comparator circuit could do the trick, I don't know. Bottom line is that if the operation of this sensing circuitry drawn more power than the extra 2-3 LED's then all is mute.
Any suggestions??
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